Plastic mineral composition



UNITED STATES PATENT EFIcE.

JOHN L. STEIVART AND JAMES L. HASTINGS, OF PHILADELPHIA, PENNSYIP VANIA, ASSIGNORS, BY MESNE ASSIGNMENTS, TO THE VELSBACH INOAN- DESCENT GAS LIGHT COMPANY, OF JERSEY CITY, NE\Y JERSEY.

PLASTIC MINERAL COMPOSITION, 8.4.0.

SPECIFICATION forming part of Letters Patent No. 396,301, dated January 15, 1889.

Application filed September 26, 1885. Serial No. 178,207. (No specimens.) I

To all whom it may concern:

Be it known that we, JOHN L. STEWART and JAMES L. HASTINGS, of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Plastic Mineral Compost tions and Yitreous or Crystalline Compounds; and we do hereby declare that the following is a full, clear, and exact description of the illvention, which will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to a new plastic mineral composition and vitreous or crystat line compound for use in chemical and Other arts and for incandescent illumination, said composition being adapted for molding into articles of varied forms and for coating metallic and other articles to protect them from the oxidizing and corroding influences of air, moisture, acids, &c., and from injury by heat.

The plastic compound, when properly burned or fired, is highly refractory, very hard, crystalline in structure, rough 011 the surface, white or opah scent, and practically infusible.

The object of the invention is to produce a readily-incandeseing compound capable of resisting the action of intense heat, and particularly adapted for forming incandescent burners for illumination with coal-gas, watergas, or natural gas.

The plastic compound is formed of, a mixture of ingredients in about the following proportions: Magnesia oxide or carbonate, fifty grains; caustic strontia or carbonate, fifty-five grains; alumina oxide or carbonate, ten grains; fluor-spar, (calcium iiuoride,) thirty grains; feldspar, five onehundredths grain.

The materials are ground dry or in oil or water to an impalpable powder and then subjected to a moderatelyhigh heat for a short time. The compound may then be reground and the resulting powder intimately mixed in glycerine, or its equivalent, to the proper consistency for convenient handling or application. The mixture of ingredients having been properly effected, the compound is molded into the desired articles, or coated upon articles of metal or other material, and in such forms is subjected to a suitable temperature to drive oit' the hydrocarbon or other volatile matter, and then to a high temperature in a gas or other furnace, and may afterward be suspended in a gas-flame, or placed in burning gas in the open air, for completing the process of burning and for testing and proving the finished. articles.

The proportions of mineral ingredients above mentioned for forming the compound and various forms of burner attachments for illumination with gas give satisfactory results; but we do not limit ourselves to the proportions stated, as we believe other proportions will give good results, and they may be varied without departing from our invention.

The mineral ingredients may be p ulverized in the dry state and the hydrocarbon oil or glycerine afterward added. 7

Having thus (1 scribrd our invention, what we claim, and desire to secure by Letters Patent, is

1. A composition for forming a refractory crystalline compound, consisting of magnesia oxide or carbonate, caustic stront-ia or carbonate, alumina oxide or carbonate, calcium fluoride, (fluor-spar,) feldspar, and hydrocarbon oil, glycerine, or their equivalents.

2. A refractory crystalline compound composed of magnesia oxide or carbonate, caustic strontia or carbonate, alumina oxide or carbonate, calcium fluoride, (fluor-spar,) and feldspar, said compound being white or opale*cent, rough on the surface, and prrwtimlly infusible.

I11 testimonythat we claim the foregoing as our own we altix our signatures in presence of two witnesses.

JOHN L. STENVART. JAMES L. HASTINGS. \Yitnesses:

WM. R. BRowN, CHAS. MATHEWs, Jr. 

